The design and development of high-temperature superconducting magnets require a profound understanding of the magnets behavior under overcurrent conditions arising from operating condition disturbances. This knowledge is indispensable for averting damage to the system from such events. This is typically achieved by incorporating an adequate amount of conventional conductors (predominantly copper) in parallel as a stabilizer and a suitable quench protection system that rapidly terminates the current flow when necessary. In order to design the stabilizer and quench protection, it is necessary to have precise knowledge about the local dissipation, which defines the local temperature rise and, ultimately, the formation of hot-spots and damage to the superconducting layer. In this presentation, we will discuss a novel apparatus recently developed at TU Vienna that allows for the assessment of the local (2-dimensional) electric field at pulsed overcurrents with a resolution of approximately 100 µm. The gathered electric field data can be evaluated at a specific current and provide information about its temporal progression at a defect. In combination with scanning Hall probe microscopy, from which the local current during a current pulse can be derived, the local dissipation can be calculated. This will ultimately lead to a better understanding of hot-spot formation and possibly to the identification of problematic defects using a reel-to-reel magnetization measurement.